Abstract
In a high frequency ultrasonic imaging system, high signal-noise-ratio (SNR) is highly demanded to acquire high quality images. Transducer sensitivity enhancement is essential to increase the SNR. In this work, size effect of transducers with working frequency 12MHz and 20MHz is systematically studied to find its relationship with sensitivity. FEM (Finite Element Method) models are built to analyze the impedance and sound field characteristics for different size transducers. Pulse-echo measurement experiments are carried out to compare the performance variation induced by the size effect. Simulation results suggest that working frequency is mainly determined by the piezoelectric slice thickness, the values of admittance are dependent on the area value of transducers and the optimum width is 1.5mm-1.7mm for 12MHz transducer and 1.1mm-1.3mm for 20MHz transducer. The admittance measurement results and pulse-echo results confirm the simulation conclusion and certify that 12MHz transducer with 1.5mm width and 3.0mm length, 20MHz transducer with 1.2mm width and 3.0mm length have the highest sensitivities. Their echo peak-peak values can reach 1.248V and 1.332V, respectively. These results indicate that sensitivity can be enhanced by optimizing transducer size. Methods utilized in this work are of great significance in a broader range of transducer design cases such as IVUS system and array transducers.
Highlights
High frequency transducers are widely used in clinical applications such as intravascular ultrasound [1], ultrasound endoscopic [2] and ophthalmology [3]
To obtain higher signal-noiseratio (SNR) and improve image quality, it is essential to improve the sensitivity of high frequency transducer in ultrasonic imaging systems [6], [7]
The sensitivity of transducer is influenced by many factors including acoustic impedance matching [8], [9], electrical matching network [10], [11], cable transmission loss [12] etc
Summary
High frequency transducers are widely used in clinical applications such as intravascular ultrasound [1], ultrasound endoscopic [2] and ophthalmology [3]. The sensitivity of transducer is influenced by many factors including acoustic impedance matching [8], [9], electrical matching network [10], [11], cable transmission loss [12] etc. An alternative method is interfacing an amplifier closely to the transducer before connecting to the cable, high sensitivity is achieved while additional noise was reduce and signal amplification was provided [20]. This method can isolate the cable effect, which has great influence on the performance of high frequency transducer [12].
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